Improvement in shoes and dies for stamping-mills



w. HAINSWORTHL Shoes and Wes for Stamping Mills. N0 158,702. 'PatentedJan.,l2,'1875.

UNITED STATES PATENT OFFICE.

WILLIAM HAINSVVORTII, OF PITTSBURG, PENNSYLVANIA, ASSIGNOR TU PITTSBURG STEEL-CASTING COMPANY, OF SAME PLACE.

IMPROVEMENT IN SHOES AND DIES FOR STAMPING-MILLS.

Specification forming part of Letters Patent No; 158,702, dated January 12, 1875; application filed December 19, 1874.

To all whom it may concern:

Be it known that I, \VILLIAM llluxswoatrfl, of Pittsburg, county of Allegheny, 'State of Pennsylvania, have invented or discovered a new and useful Improvement in Shoes and Dies for Stai1ipin '--.\1ills; and I do hereby declare the tbllowing to be a full, clear, concise,- and exact description thereof, reference being had to the accompanying drawing making a part of this specification, in which like letters indicate like parts.

Figure 1 is a perspective view of a wroughtiron ring, such as I employ in working my improvement. Fig. 2 is a like view of one of the shoes complete; and Fig. 3 is a like view of a die complete.

My improvement relates to the manufacture of shoes and dies for that class of stamping-mills used in the crushing or pulverization of quartz, rock, ores, stone, &c.

These shoes and dies have heretofore been commonly made of cast-iron or cast-steel.

\Vhen made of cast-iron they have been found to be too brittle for long and continuous use in the crushing of hard rock, so that they spall or splinter off at the outer edge, and consequently have to be frequently renewed. And the ditiiculty encountered in the manufacture of cast-steel shoes and dies for such work is, that to be durable they must be made very hard in tempering, but blocks of steel of such shape and size can be properly tempered successfully to a slight dept-h only, and are liable to burst or fracture it tempered over about two inches deep. I r

In carrying out my improvement, I make a wrought-iron tubular shell or ring, ll, of about the size of the exterior of the shoeor die to be made. This shell is heated to about or a little above a welding heat. Into this heated shell, arranged in a suitable mold, it need be, I cast the body of the shoe as at D, or of the die I), these parts being the same generally in shape, except that the shoe has a stem, (1,

by which it is attached to the vertically-moving plunger, which carries it, the die being seated in the usual or any convenient way in the box or hopper.

In casting the body part of the shoe or die,

joint or union with the inner face of the shell.

so that the two make the solid shoe or die roqnired. 7

Another way of efl'ecting this union so as to make substaiuially the same article is to shrink and weld the wrought-iron shell onto the previors'y cast or lbrgcd hard-metal body.

The product secured in either case, gives me a hard-metal working face, surrounded by a tough fibrous band or shell, such as to prevent the splintering or spalling above. IGilfl'lill to, (when cast-iron or like material is used,) or it the body be made of steel or like material requiring tempering, the bursting or fracturing of the shell either in or as a consequence of the tempering, is practically prevented, and a much more complete, perfect, and deeper tempering can be eli'ected in consequence of the use of the wrought-iron sur-. rounding shell.

Instead of wrought-iron for the ring or shell, other tough tibro'us metal having like qualities may be employed.

\Vha-t I claim as my invention, and desire to secure by Letters Patent, is

In the manutacture of shoes and dies for stamping-mills, the cmnbination of a wroughtiron or other tough fibrous shell with a hardmetal body, substantially as set forth.

In testimony whereof I have hereunto set my hand.

\VILLIAM ll A l NSWOR'I] l.

'itnesses:

J. H. IIILLERMAN, Gnonen ll. Unius'rv. 

